[rules-users] Resource Change Scanner Service modified date error

Tue Jan 17 03:44:03 EST 2012

Hi Esteban

Unfortunately I haven't had time to work further on this issue, so I don't
have an answer yet.

All I can say for now is it seems that the ReaderResources are being
created along with the URLResource each time. This is evidenced by the
details below.

In my test, I have the following changeset based on the mortgages sample (I
have changed my hosting port):

----------------------------------------------------------------------------------------------

*<change-set xmlns='http://drools.org/drools-5.0/change-set'*
*    xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'*
*    xs:schemaLocation='http://drools.org/drools-5.0/change-set
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd'
>*
*    <add>*
*         <resource source='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST'
type='PKG' />*
*    </add>*
*</change-set>*

----------------------------------------------------------------------------------------------

This changeset can be read as a UrlResource, ClassPathResource or
ByteArrayResource. I then use the following code to initialise the
KnowledgeAgent:

----------------------------------------------------------------------------------------------

*SystemEventListenerFactory.setSystemEventListener(new
PrintStreamSystemEventListener(System.out));*
*        *
*KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent("MortgageAgent");*
*Resource changeset = ResourceFactory.newClassPathResource("ChangeSet.xml");
*
*kagent.applyChangeSet(changeset);*

----------------------------------------------------------------------------------------------

Within the System event listener output, I see that the KnowledgeAgent
picks up all of the KnowledgeDefinitions from Drools and creates them as
new UrlResources. Next, it picks up the KnowledgeDefinitions from drools
and creates these all as null ReaderResources. Here is some output from my
System event listener:

----------------------------------------------------------------------------------------------

*[2012-01-17 10:32:32,577:debug] KnowledgeAgent rebuilding KnowledgeBase
using ChangeSet*
*[2012-01-17 10:32:33,410:debug] KnowledgeAgent building resource map*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent no resource mapped for
rule=[Rule name=Dummy rule, agendaGroup=MAIN, salience=0, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=Dummy rule, agendaGroup=MAIN, salience=0,
no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=Underage, agendaGroup=MAIN, salience=10,
no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=Bankruptcy history, agendaGroup=MAIN,
salience=10, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=No bad credit checks, agendaGroup=MAIN,
salience=10, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=no NINJAs, agendaGroup=MAIN, salience=10,
no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=Row 3 Pricing loans, agendaGroup=MAIN,
salience=0, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=Row 1 Pricing loans, agendaGroup=MAIN,
salience=0, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=Row 2 Pricing loans, agendaGroup=MAIN,
salience=0, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=CreditApproval, agendaGroup=MAIN,
salience=0, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=DateDslRule, agendaGroup=MAIN,
salience=0, no-loop=false]*
*[2012-01-17 10:32:33,411:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=CheckBoxDslRule, agendaGroup=MAIN,
salience=0, no-loop=false]*
*[2012-01-17 10:32:33,412:debug] KnowledgeAgent mapping
resource=[UrlResource path='
http://localhost:8090/guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST']
to KnowledgeDefinition=[Rule name=RegexDslRule, agendaGroup=MAIN,
salience=0, no-loop=false]*
*[2012-01-17 10:32:33,412:debug] KnowledgeAgent mapping
resource=[ReaderResource resource=null encoding='null'] to
KnowledgeDefinition=org.drools.rule.TypeDeclaration at b10723b8*
*[2012-01-17 10:32:33,412:debug] KnowledgeAgent notifier subscribing to
resource=[ReaderResource resource=null encoding='null']*
*[2012-01-17 10:32:33,412:debug] ResourceChangeNotification subscribing
listener=org.drools.agent.impl.KnowledgeAgentImpl at 54b216b3 to
resource=[ReaderResource resource=null encoding='null']*
*[2012-01-17 10:32:33,412:debug] ResourceChangeScanner subcribing
notifier=org.drools.io.impl.ResourceChangeNotifierImpl at 77f06d35 to
resource=[ReaderResource resource=null encoding='null']*
*[2012-01-17 10:32:33,412:debug] KnowledgeAgent mapping
resource=[ReaderResource resource=null encoding='null'] to
KnowledgeDefinition=org.drools.rule.TypeDeclaration at a562a3f*
*[2012-01-17 10:32:33,412:debug] KnowledgeAgent mapping
resource=[ReaderResource resource=null encoding='null'] to
KnowledgeDefinition=org.drools.rule.TypeDeclaration at 9baaa763*
*[2012-01-17 10:32:33,412:debug] KnowledgeAgent mapping
resource=[ReaderResource resource=null encoding='null'] to
KnowledgeDefinition=org.drools.rule.TypeDeclaration at fadf3f01*
*[2012-01-17 10:32:33,412:info] KnowledgeAgent new KnowledgeBase now built
and in use*
*[2012-01-17 10:32:33,412:debug] KnowledgeAgent finished rebuilding
KnowledgeBase using ChangeSet*

----------------------------------------------------------------------------------------------

As a result of these ReaderResources existing, the ResourceChangeScanner
cannot run as the ReaderResources do not have a modified date.

At the moment I am not sure why these ReaderResources are created but I
would imagine they are there to represent the drools domain facts. There
are four facts in the mortgages sample and four ReaderResources are created.

Regards

Dean

2012/1/17 Esteban Aliverti <esteban.aliverti at gmail.com>

> Dean, did you figure out why your code is using a ReaderResource? There
> are other threads reporting this same problem.
>
> Best Regards,
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> - Developer @ http://www.plugtree.com
> - Blog @ http://ilesteban.wordpress.com
>
>
> On Fri, Jan 6, 2012 at 2:14 PM, Jiri Svitak <jsvitak at redhat.com> wrote:
>
>> Hello Dean,
>>
>> you are right,
>> https://issues.jboss.org/browse/GUVNOR-1699
>> solves something different. Bugzilla
>> https://bugzilla.redhat.com/show_bug.cgi?id=733008
>> still waits to be solved. I have updated this bugzilla to be linked to
>> belonging JIRA issues.
>> You can look also on other bugs which have the same root cause. But I am
>> not developer, so I cannot
>> tell you when it'll be fixed.
>>
>> Jiri Svitak
>>
>> On 01/05/2012 02:27 PM, Dean wrote:
>> > Hi
>> >
>> > I am experiencing a problem with starting the
>> ResourceChangeScannerService
>> > as described here: https://bugzilla.redhat.com/show_bug.cgi?id=733008
>> >
>> > I can create a KnowledgeAgent instance and apply a changeset to it which
>> > loads the desired package from Guvnor. However, as soon as I attempt to
>> > start the ScannerService in order to be notified of changes to this
>> package
>> > I immediately receive the exception: java.lang.IllegalStateException:
>> reader
>> > does have a modified date. Then on every scanner interval following, the
>> > scanner fails each time with the same error message.
>> >
>> > Apparently, this issue has already been fixed here:
>> > https://issues.jboss.org/browse/GUVNOR-1699
>> >
>> > However, I am still experiencing this problem even with Drools
>> 5.4.0.Beta1
>> >
>> > Could somebody perhaps help me with this. I am attempting to rebuild the
>> > source code on my side, however, I am having endless problems with
>> Maven.
>> >
>> > Regards
>> >
>> > Dean
>> >
>> > --
>> > View this message in context:
>> http://drools.46999.n3.nabble.com/Resource-Change-Scanner-Service-modified-date-error-tp3634802p3634802.html
>> > Sent from the Drools: User forum mailing list archive at Nabble.com.
>> > _______________________________________________
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